Concrete dam.



G. W. FREEMAN. CONCRETE DAM. APPLICATION FILED AUG 14, 1912.

Patented 'Nov. 5, 1912.

vent any uplift-of said decks.

UNITED STATES PATENT OFFICE.

GEORGE W. FREEMAN, OF ST. PAUL, MINNESOTA, ABSIGNOB ONE-HALF T0 JOHN B.

STBYKEB, ors'r. rem, unmnsorn.

To all whom it may concern:

Be it known that I, GEORGE W. FREEMAN, a citizen of the United States, residing at St. Paul, in the count of Ramsey and State of Minnesota, have invented new and useful Improvements in Concrete Dams, of whlch the following is a specification.

My invention relates to an improvement in concrete dams. Its object is to provide a dam having its decks formed of a plurallty of concrete beams suitably supported and bonded together to form a unitary structure.

A further object. is to provide means for tying the deck beams to the buttresses of the dam to strengthen the structure and pre- A. further object is to provide such a structure readily adaptable to the contraction and expansion of its parts.

My invention is particularly, though not exclusively, adapted for use in cold climates where if the concrete were molded iwm'tu, it would be necessary to discontinue the work during the winter.

lln the drawings, Figure 1 is a front elevation of the forward side of the dam embodying my invention; Fig. 2 is a sectional view of the same taken on the line 22 of Fig. 1; Fig. 3 is a detail sectional view taken on the line 33 of Fig. 1, and Fig. 4 is a detail view showing a portion of a buttress in section, an end elevation of beams and means for tying the beams to the buttresses of a dam.

Referring to the accompanying drawings,

.1 have used the reference numeral to indicate the buttresses of thedam, which may be constructed in situ of any suitable material. The reinforced concrete toe 13, heel 14: and crown 15 are cast in place. The decks 16 and 16 consist of a plurality of deck-beams 17. These beams, bonded to each other and to said toe, crownand heel are tied to the buttresses 10 and form a unitary structure. All of said members are re inforced by rods in the usual manner.

The beams 17 are molded se arately at any convenient place and may he built on straight lines, as illustrated, or may be curved to form either concave or convex deck sections between the buttresses of-tiie dam. In the longitudinal corners of the upper surface of the beams 17, I mold a recess 18 to form key ways for the grouting Specification 0! Letters Patent. Application filed Au'g'ustlflmlz. Serial No. 715,014.

in one end thereof andwith material. hereinafter specified. Each beam 'gether to form the desired structural unit.

concur]: nut.

Patented Nov. 5, 191 2.

is supplied with a looped rod 20 embedded a second looped opposite end. s 21, secured to the butrod 20' embedded in its Sheet. metal cli.

.tresses 10 by em edded U bolts 22 and nuts oo 23, retain the anchor bolts which ass through the looped rods 20 and 20' of a utting beams. Nuts 24 threaded 'on said bolts 25 are placed in positions-above and adjacent to said rods 20 and 20. By this means I tie the beams to the buttresses 10 to secure stifi'ness and onthe down stream deck to protect against any uplift which might otherwise occur. I prefer to slot the cllps 21 to allow for variations in the width of the beams 17 The toe 13, heel 14 and crown 15 are each formed with a recess 18 similar to those which form key ways'in the beams 17. The beams are arranged to rest at their ends on adjacent buttresses and are spaced apart from each other at their ends and sides and from said toe, heel and crown. outing material 26 is then applied to the corrugated faces 10 of the-buttresses 10, to the spaces between said beams, toe, heel and crown including and filling the key ways formed by the recesses 18. I thus unite all of the parts of the dam into a strong structural unit. I

I have provided for a slight movement of one end of each deck beam to allow for its contraction and expansion. To this end the loops of the rods 20 are wound with oakum or a like resilient wrapper 27 to prevent close contact of the grouting with said rods, thus permitting a slight expansion and contraction of the beams. The base at one end of each beam is faced with a wood or fiber sheet 28 to prevent the grouting material from binding said end to its supporting buttress and thereby provide a sliding joint. At each slidable end of said beams is a compressible wood or fiber sheet or plate 29 which permits a slight longitudinal move ment of said beams.

My invention is advantageous for the reason that large forms or molds commonl used in the construction of a monolithic concrete dam may be eliminated and for the further reason that the deck beams may be conveniently, constructed during any season of the year in a limited space on shore, and thereafter placedin position and bound tobuttresses.

What I claim 'asnew and desire to pro tect by Letters Patent" is:

1. A dam comprising a plurality ofbuttresses built in situi and decks on said buttresses consisting of separately molded concrete beams bonded to each other and to said 2. A dam having a plurality of concrete saidv key ways and between sald beams for -a compression plate beam.

bonding the same together.

I 4. A dam having buttressesof any suitable material provided wlth a toe, heel and crown, separately molded concrete beams formed with abutting anchor recesses, like recesses in the toe, heel and crown and grouting for bonding the parts together.

5. A dam having buttresses formed with corrugated bearing faces, decks on said but tresses consisting of separately molded concrete beams, each beam having a recess in the longitudinal corners of its face abutting a like recess in the adjacent beams, and grouting material in said recesses and between said beams and buttresses for bonding the same together.

6; A dam'having a plurality of buttresses built in situ, decks consisting of, separately molded concrete beams overlapping at their ends on said buttresses, each beam having a recess in the longitudinal corners of its face, the adjoining recesses in said beams being adapted to form key ways, a grouting material in said key ways, between each of said beams and between said beams and but tresses, a spacing sheet between one end of each beam and its supporting buttress, and at said end of each 7. A dam having a plurality of concrete buttresses, decks on said buttresses consisting of separately molded concrete beams bonded to each other and anchored to said buttresses by means of bolts embedded therein, said beams being slidable at one end on the buttresses to permit expansion and. contraction; s

8. A dam having a plurality of buttresses, decks consisting of separately molded concrete beams resting at their ends on said buttresses, each beam having a recess in -the longitudinal corners of its face, the adjoining recesses in said beams bein adapted to form key ways, U bolts embed ed at intervals in said buttresses, clips secured to said U bolts, anchor bolts in sa d clips, means for securing said beams to said bolts and a grouting material in. said key ways between each of said beams and between said beams and buttresses.

.9. A dam having a plurality of concrete buttresses, decks on said buttresses consisting of separately molded concrete beams, said beams being spaced apart at their ends and sides and slidable atone of their ends on .their supporting buttresses, anchor bolts secured to said'but tresses, a looped rod embedded in each end of said beams, said rods,

in abutting beams being adapted to receive an anchor bolt, nuts on said bolts for retaining said rods in position thereon, a resilient wrapper for the looped rods in the slidable ends of said beams and grouting for bonding the beams to each other and to the base and crown ofsaid buttresses.

10. A dam having a plurality of buttresses I built in situ, decks consisting of individually molded concrete beams su ported at their ends on said buttresses, eacii beam having a recess in the longitudinal corners of its face, the adjoining recesses in said beams being adapted to form key ways, a spacing sheet between one end of'each beam and its supporting buttress, a compression plate at the same end of each beam, U bolts embedded at intervals in said buttresses, clips'secured to said U bolts, anchor bolts attached tosaid clips, a looped rod embedded in each end of said beams, the rods in abutting beams being adapted to receive one of said anchor bolts, nuts on said bolt for securing said rods thereto and grouting in said key ways, between each of said beams and between said beams and buttresses.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE W. FREEMAN.

Witnesses:

F. M. HARDY, F. C. GASWELL. 

